872 citations · 3.4k across the 46 of their papers we have counts for
21 papers · 1 filter
Landau Potential for Multiferroic Mn_2GeO_4
A. B. Harris
A high-order Landau potential for Mn_2GeO_4 is developed.
Symmetry Analysis of Multiferroic Co_3TeO_6
A. B. Harris
A phenomenological explanation of the magnetoelectric behavior of Co_3TeO_6 is developed. We explain the second harmonic generation data and the magnetic field induced spontaneous…
Landau Theory of Tilting of Oxygen Octahedra in Perovskites
A. B. Harris
The list of possible commensurate phases obtained from the parent tetragonal phase of Ruddlesden-Popper systems, ABC for general due to a single phase tran…
Symmetry Analysis for the Ruddlesden-Popper Systems, Ca3Mn2O7 and Ca3Ti2O7
A. B. Harris
We perform a symmetry analysis of the zero-temperature instabilities of the tetragonal phase of Ca3Mn2O7 and Ca3Ti2O7 which is stable at high temperature. We introduce order parame…
Classifying Possible Tilting of Oxygen Octahedra in Perovskites
A. B. Harris
The list of possible commensurate phases obtained from the parent tetragonal phase of perovskites by allowing the tilting of octahedra of oxygen ions is reexamined. It is found tha…
Phonons and their Coupling to Magnons in n=2 Ruddlesden-Popper Compounds
A. B. Harris
The number of absorption and Raman optical modes for each Wyckoff orbit in the high-temperature tetragonal (I4/mmm) parent lattice of the Ruddlesden-Popper compounds CaXO$_…
A System Exhibiting Toroidal Order
A. B. Harris
A two dimensional system of discs upon which a triangle of spins are mounted is shown to undergo a sequence of interesting phase transitions as the temperature is lowered. We are m…
Magnetic structure and magnetoelectric coupling in bulk and thin film FeVO
A. Dixit, G. Lawes, A. B. Harris
We have investigated the magnetoelectric and magnetodielectric response in FeVO, which exhibits a change in magnetic structure coincident with ferroelectric ordering at $T_{N2}…
Possible Orientationally Ordered States of Bucky-Cubane
A. B. Harris
For temperatures above K CCH forms a cubic crystal consisting of two interpenetrating fcc sublattices, one of freely rotating Buckys C and the…
Evidence for large electric polarization from collinear magnetism in TmMnO3
V. Yu. Pomjakushin, M. Kenzelmann, A. Donni +8
There has been tremendous research activity in the field of magneto-electric (ME) multiferroics after Kimura et al. [1] showed that antiferromagnetic and ferroelectric order coexis…
Order Parameters and Phase Diagrams of Multiferroics
A. B. Harris, Amnon Aharony, O. Entin-Wohlman
The symmetry properties, order parameters, and magnetoelectric phase diagrams of multiferroics are discussed. After brief reviews of NiVO, TbMnO, and RbFe(MoO)$…
Effect of Inversion Symmetry on Incommensurate Order in Multiferroic RMn2O5, R=rare earth
A. B. Harris, M. Kenzelmann, Amnon Aharony +1
Starting from the irreducible representations of the group of the wave vector we construct the spin wave functions consistent with inversion symmetry, neglected in the usual repres…
Order Parameters and Phase Diagram of Multiferroic RMnO
A. B. Harris, Amnon Aharony, Ora Entin-Wohlman
The generic magnetic phase diagram of multiferroic RMnO (with R=Y, Ho, Tb, Er, Tm), which allows different sequences of ordered magnetic structures for different R's and di…
Erratum: Landau Analysis of the Symmetry of the Magnetic Structure and Magnetoelectric Interaction in Multiferroics [Phys. Rev. B 76, 05447 (2007)]
A. B. Harris
An error in the spin wavefunction for the rare earth sublattices of TbMn_2O_5 is corrected.
Electric field control of magnetic phase transitions in Ni3V2O8
P. Kharel, C. Sudakar, A. B. Harris +2
We report on the electric field control of magnetic phase transition temperatures in multiferroic Ni3V2O8 thin films. Using magnetization measurements, we find that the phase trans…
The Symmetry of Multiferroics
A. Brooks Harris
This paper represents a detailed instruction manual for constructing the Landau expansion for magnetoelectric coupling in incommensurate ferroelectric magnets. The first step is to…
Theoretical Analysis of the "Double-q" Magnetic Structure of CeAl2
A. B. Harris, J. Schweizer
A model involving competing short-range isotropic Heisenberg interactions is developed to explain the "double-q" magnetic structure of CeAl. For suitably chosen interactions, t…
Magnetic Structure and Spin Waves in the Kagomé Jarosite compound
T. Yildirim, A. B. Harris
We present a detailed study of the magnetic structure and spin waves in the Fe jarosite compound for the most general Hamiltonian involving one- and two…
Ferroelectricity in Incommensurate Magnets
A. B. Harris, G. Lawes
We review the phenomenology of coupled magnetic and electric order parameters for systems in which ferroelectric and incommensurate magnetic order occur simultaneously. We discuss…
Magnetically driven ferroelectric order in NiVO
G. Lawes, A. B. Harris, T. Kimura +8
We show that for NiVO long-range ferroelectric and incommensurate magnetic order appear simultaneously in a single phase transition. The temperature and magnetic field…
Quantum Dynamics of a Hydrogen Molecule Confined in a Cylindrical Potential
Taner Yildirim, A. Brooks Harris
We study the coupled rotation-vibration levels of a hydrogen molecule in a confining potential with cylindrical symmetry. We include the coupling between rotations and translations…